linux-kernel - Re: [PATCH V1 01/23] perf intel-pt: Add a test for system-wide side band

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Date:   Thu, 5 May 2022 15:37:23 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Alexey Bayduraev <alexey.v.bayduraev@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Leo Yan <leo.yan@...aro.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V1 01/23] perf intel-pt: Add a test for system-wide side band

On Thu, May 5, 2022 at 9:56 AM Adrian Hunter <adrian.hunter@...el.com> wrote:
>
> Add a test for system-wide side band even when tracing selected CPUs.
>
> Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>

Tested-by: Ian Rogers <irogers@...gle.com>

Thanks,
Ian

> ---
>  tools/perf/tests/shell/test_intel_pt.sh | 71 +++++++++++++++++++++++++
>  1 file changed, 71 insertions(+)
>  create mode 100755 tools/perf/tests/shell/test_intel_pt.sh
>
> diff --git a/tools/perf/tests/shell/test_intel_pt.sh b/tools/perf/tests/shell/test_intel_pt.sh
> new file mode 100755
> index 000000000000..a3298643884d
> --- /dev/null
> +++ b/tools/perf/tests/shell/test_intel_pt.sh
> @@ -0,0 +1,71 @@
> +#!/bin/sh
> +# Miscellaneous Intel PT testing
> +# SPDX-License-Identifier: GPL-2.0
> +
> +set -e
> +
> +# Skip if no Intel PT
> +perf list | grep -q 'intel_pt//' || exit 2
> +
> +skip_cnt=0
> +ok_cnt=0
> +err_cnt=0
> +
> +tmpfile=`mktemp`
> +perfdatafile=`mktemp`
> +
> +can_cpu_wide()
> +{
> +       perf record -o ${tmpfile} -B -N --no-bpf-event -e dummy:u -C $1 true 2>&1 >/dev/null || return 2
> +       return 0
> +}
> +
> +test_system_wide_side_band()
> +{
> +       # Need CPU 0 and CPU 1
> +       can_cpu_wide 0 || return $?
> +       can_cpu_wide 1 || return $?
> +
> +       # Record on CPU 0 a task running on CPU 1
> +       perf record -B -N --no-bpf-event -o ${perfdatafile} -e intel_pt//u -C 0 -- taskset --cpu-list 1 uname
> +
> +       # Should get MMAP events from CPU 1 because they can be needed to decode
> +       mmap_cnt=`perf script -i ${perfdatafile} --no-itrace --show-mmap-events -C 1 2>/dev/null | grep MMAP | wc -l`
> +
> +       if [ ${mmap_cnt} -gt 0 ] ; then
> +               return 0
> +       fi
> +
> +       echo "Failed to record MMAP events on CPU 1 when tracing CPU 0"
> +       return 1
> +}
> +
> +count_result()
> +{
> +       if [ $1 -eq 2 ] ; then
> +               skip_cnt=`expr ${skip_cnt} \+ 1`
> +               return
> +       fi
> +       if [ $1 -eq 0 ] ; then
> +               ok_cnt=`expr ${ok_cnt} \+ 1`
> +               return
> +       fi
> +       err_cnt=`expr ${err_cnt} \+ 1`
> +}
> +
> +test_system_wide_side_band
> +
> +count_result $?
> +
> +rm -f ${tmpfile}
> +rm -f ${perfdatafile}
> +
> +if [ ${err_cnt} -gt 0 ] ; then
> +       exit 1
> +fi
> +
> +if [ ${ok_cnt} -gt 0 ] ; then
> +       exit 0
> +fi
> +
> +exit 2
> --
> 2.25.1
>